CN111736006B - Convenient detection method applied to wireless charging coil RMS current - Google Patents
Convenient detection method applied to wireless charging coil RMS current Download PDFInfo
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Abstract
The invention discloses a convenient detection method applied to wireless charging coil RMS current, which comprises the following steps: s1, detecting the input current IPA of the transmitting module of the wireless charging system, and obtaining the mean value of the input current IPA equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG(ii) a S2, according to the average value Icoil of the currentAVGAnd RMS value IcoilRMSCalculating to obtain RMS value Icoil of current Icoil in the transmitting moduleRMS. The invention enables direct detection of the RMS value of the AC side current at the DC side of the wireless charging coil without introducing the additional cost and power loss of AC side current detection.
Description
Technical Field
The invention relates to the technical field of wireless charging foreign matter detection, in particular to a convenient detection method applied to wireless charging coil RMS current.
Background
As shown in fig. 1, the transmission path of the wireless charging energy is shown as a transmission module (TX) in the wireless charging system on the left and a reception module (RX) in the wireless charging system on the right. During energy transmission, P if foreign bodies are presentLossWill increase so that the foreign object detection is actually by detecting PLossTo judge. For formula PLoss=PPT–PPRIn which P isPTIs the energy of the TX transmission, PPRIs the energy received by RX, this value can be obtained by energy communication; for formula PPT=Pin–PPTLoss，PinCan be derived from the input power if the exact P can be derivedPTLossCan accurately obtain the P of the wireless charging systemLossTo detect foreign matter.
For PPTLossThere are two main existing techniques for calculating (1):
1. estimating a fixed P for a given TXPTLossA value;
2. and sampling the current of the connection point of the Cp and the Lp on the coil by using the high-precision ADC.
The technology 1 has the risks of large errors, inaccurate judgment of foreign matters or misjudgment; technique 2 has the additional cost and power loss of AC side current sensing. The inventionIs that P is calculated by directly detecting the effective value of the AC side current at the DC sidePTLossThe precision is higher than that of the technology 1, and the cost is lower than that of the technology 2.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the existing problems, the method is applied to the wireless charging coil RMS current convenient detection method, and the AC side RMS current can be directly detected through the DC side.
The technical scheme adopted by the invention is as follows:
a convenient detection method applied to wireless charging coil RMS current comprises the following steps:
s1, detecting the input current IPA of the transmitting module of the wireless charging system, and obtaining the mean value of the input current IPA equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG；
S2, according to the average value Icoil of the currentAVGAnd RMS value IcoilRMSCalculating to obtain RMS value Icoil of current Icoil in the transmitting moduleRMS。
Further, step S1 includes the following sub-steps:
s11, detecting input current IPA of a transmitting module of the wireless charging system, amplifying the input current IPA by K times, converting the input current IPA into voltage information, and biasing the voltage information to be near a direct current reference level Vbias during amplification, namely obtaining a voltage waveform sns _ out relative to the direct current reference level Vbias;
s12, the voltage waveform sns _ out is averaged after being overturned relative to the direct current reference level Vbias, and then the direct current reference level Vbias is subtracted to obtain the mean value of the input current IPA which is equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG。
Further, the circuit structure for implementing step S11 is:
the detection resistor Rs is arranged at the input end of a transmitting module of the wireless charging system;
two ends of the detection resistor Rs are respectively connected to the positive input end and the reverse input end of the operational amplifier OP _ CS through a resistor;
the positive input end of the operational amplifier OP _ CS is connected with a direct current bias circuit; the dc bias circuit is used to provide a dc reference level Vbias.
Further, the working method of implementing the circuit structure of step S11 is as follows:
the input current IPA flows through the detection resistor Rs, and a voltage difference is generated between two ends of the detection resistor Rs;
the voltage difference is amplified by K times through an operational amplifier OP _ CS to obtain the voltage information;
at the time of amplification, the output of the operational amplifier OP _ CS is biased near the dc reference level Vbias by a dc bias circuit, and a voltage waveform sns _ out with respect to the dc reference level Vbias is obtained.
Further, the circuit structure for implementing step S12 is:
the voltage waveform sns _ out is input into a negative input end of a comparator COMP, a reference level Vbias is input into a positive input end of the comparator COMP, and an output end of the comparator COMP is connected with a Logic controller Logic; then, connecting the positive input end and the negative input end of a comparator COMP through two paths: the negative input end of one route comparator COMP is connected with the positive input end sequentially through a switch S1 and a switch S2, and the negative input end of the other route comparator COMP is connected with the positive input end sequentially through a switch S3 and a switch S4; an RC filter circuit consisting of a resistor R1 and a capacitor C1 which are connected in series is connected between an electrical connection point between the switch S1 and the switch S2 and an electrical connection point between the switch S3 and the switch S4; meanwhile, the electrical connection point between the capacitor C1 and the switch S4 is also grounded through the switch S5; the switch S1, the switch S2, the switch S3 and the switch S4 are controlled by a Logic controller Logic, and the switch S5 is controlled by the MCU.
Further, the working method of implementing the circuit structure of step S12 is as follows:
s121, comparing the voltage waveform sns _ out and the reference level Vbias by the comparator COMP:
(1) when the voltage waveform sns _ out is higher than the direct current reference level Vbias, the comparator COMP outputs a low level to the Logic controller Logic, the Logic controller Logic controls the switches S1 and S4 to be closed, and the voltage waveform sns _ out is converted according to sns _ out-Vbias;
(2) when the voltage waveform sns _ out is lower than the direct current reference level Vbias, the comparator COMP outputs a high level to the Logic controller Logic, the Logic controller Logic controls the switches S2 and S3 to be closed, and the voltage waveform sns _ out is converted according to Vbias-sns _ out;
s122, sampling the RMS value IcoilRMSWhen the switch S5 is controlled to be closed by the MCU, the switch S1, the switch S2, the switch S3 and the switch S4 are controlled to be opened by the Logic controller Logic, so that the negative electrode of the capacitor C1 is grounded, and sns _ out-vbias is realized by the holding action of the capacitor C1;
s123, calculating a mean value Icoil equivalent to an average value Icoil of the current Icoil of the coil in the transmitting module by detecting the voltage of an electrical connection point between the resistor R1 and the capacitor C1 and combining the detection resistor Rs and the amplification factor K to obtain an average value Icoil of the input current IPAAVG。
Further, the mean value of the input current IPA calculated by combining the detection resistor Rs and the amplification factor K is equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVGThe calculation formula of (2) is as follows:
wherein V is a voltage at an electrical connection point between the resistor R1 and the capacitor C1.
Further, an average value Icoil of the current IcoilAVGAnd RMS value IcoilRMSThe equivalent relationship is as follows:
wherein, KfIs an average value Icoil of the current IcoilAVGAnd RMS value IcoilRMSThe form factor of (2).
Further, when the wireless charging is heavily loaded, the waveform on the coil is close to a sine wave,
。
further, when the wireless charging is lightly loaded, the waveform on the coil is close to a triangular wave,
。
in summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention enables direct detection of the RMS value of the AC side current directly at the DC side of the wireless charging coil without introducing the additional cost and power loss of AC side current detection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a wireless charging energy transmission path.
FIG. 2a is a schematic diagram of a TX transmission energy process;
fig. 2b is a waveform diagram of TX transmission energy process.
Fig. 3 is a flowchart of a convenient detection method for RMS current of a wireless charging coil according to the present invention.
Fig. 4a and 4b are schematic circuit structures for implementing the method for conveniently detecting the RMS current of the wireless charging coil according to the present invention.
Detailed Description
In a wireless charging system, a transmitting module (TX) is coupled to a receiving module (RX) through a coil to transmit energy, if a foreign object (herein, a metal foreign object) exists between the TX and the RX, the temperature of the foreign object is increased in a charging process, and a large-amplitude loss of transmitted power occurs, which not only causes damage to a wireless charging device, but also causes a safety problem. In order to accurately calculate the power in TXLoss, better gain of system PLossIn order to improve the foreign object detection performance, information on the RMS current of the coil needs to be known. Therefore, the RMS current of the coil can be quickly and conveniently detected, and whether foreign matters exist can be judged according to the power loss.
As shown in the schematic diagram of TX transmission energy process in fig. 2a and the waveform diagram of TX transmission energy process in fig. 2b, a periodic current path can be decomposed into 4 processes:
1. the path of the input current IPA of the transmitting module of the wireless charging system is Q1 → C → L → Q4;
2. the path of the input current IPA of the transmitting module of the wireless charging system is Q2 → C → L → Q3; (the waveform of the current Icoil on the coil is continuous at the instant of process 1 to process 2 due to the property that the current of the inductor L cannot be abruptly changed, and the input current IPA is abruptly changed);
3. the path of the input current IPA of the transmitting module of the wireless charging system is Q3 → L → C → Q2;
4. the path of the input current IPA of the transmitting module of the wireless charging system is Q4 → L → C → Q1;
and then enters the next cycle period.
In the full-bridge mode, the input current IPA of the transmitter module of the wireless charging system is inverted (i.e., absolute) with respect to 0, and is substantially the same as the current Icoil on the coil is inverted with respect to 0.
In the half-bridge mode, after the input current IPA of the transmitting module of the wireless charging system is inverted (i.e., absolute value) with respect to 0, one half of the current IPA of the coil is exactly the same as the current Icoil of the coil inverted with respect to 0.
Therefore, according to the corresponding relationship after the input current IPA of the transmitting module of the wireless charging system and the current Icoil on the coil are inverted, the mean value (average value after absolute value) of the input current IPA can be completely equivalent to the average value of the current Icoil on the coil. And finally, obtaining the RMS current on the final coil according to the equivalent relation between the average value and the RMS value of the current Icoil.
Then, according to the above principle, as shown in fig. 3, the present application implements a convenient detection method applied to wireless charging coil RMS current, including:
s1, detecting the input current IPA of the transmitting module of the wireless charging system, and obtaining the mean value (average after absolute value) of the input current IPA equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG；
S2, according to the average value Icoil of the currentAVGAnd RMS value IcoilRMSCalculating to obtain RMS value Icoil of current Icoil in the transmitting moduleRMS。
The features and properties of the present invention are described in further detail below with reference to examples.
S1, detecting the input current IPA of the transmitting module of the wireless charging system, and obtaining the mean value of the input current IPA equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG：
S11, detecting input current IPA of a transmitting module of the wireless charging system, amplifying the input current IPA by K times, converting the input current IPA into voltage information, and biasing the voltage information to be near a direct current reference level Vbias during amplification, namely obtaining a voltage waveform sns _ out relative to the direct current reference level Vbias;
s12, the voltage waveform sns _ out is averaged after being overturned relative to the direct current reference level Vbias, and then the direct current reference level Vbias is subtracted to obtain the mean value of the input current IPA which is equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG。
In some embodiments, as shown in fig. 4a, the circuit structure for implementing step S11 is:
the detection resistor Rs is arranged at the input end of a transmitting module of the wireless charging system;
two ends of the detection resistor Rs are respectively connected to the positive input end and the reverse input end of the operational amplifier OP _ CS through a resistor;
the positive input end of the operational amplifier OP _ CS is connected with a direct current bias circuit; the dc bias circuit is used to provide a dc reference level Vbias.
The working method of the circuit structure for realizing the step S11 includes:
the input current IPA flows through the detection resistor Rs, and a voltage difference is generated between two ends of the detection resistor Rs;
the voltage difference is amplified by K times through an operational amplifier OP _ CS to obtain the voltage information;
at the time of amplification, the output of the operational amplifier OP _ CS is biased near the dc reference level Vbias by a dc bias circuit, and a voltage waveform sns _ out with respect to the dc reference level Vbias is obtained.
The figure also shows some following components, such as a triode at the output terminal of the operational amplifier OP _ CS, and in addition, the bias circuit in the embodiment is composed of a triode and a buffer Buf. This part is conventional for those skilled in the art and will not be described further herein.
In some embodiments, as shown in fig. 4b, the circuit structure for implementing step S12 is:
the voltage waveform sns _ out is input into a negative input end of a comparator COMP, a reference level Vbias is input into a positive input end of the comparator COMP, and an output end of the comparator COMP is connected with a Logic controller Logic; then, connecting the positive input end and the negative input end of a comparator COMP through two paths: the negative input end of one route comparator COMP is connected with the positive input end sequentially through a switch S1 and a switch S2, and the negative input end of the other route comparator COMP is connected with the positive input end sequentially through a switch S3 and a switch S4; an RC filter circuit consisting of a resistor R1 and a capacitor C1 which are connected in series is connected between an electrical connection point between the switch S1 and the switch S2 and an electrical connection point between the switch S3 and the switch S4; meanwhile, the electrical connection point between the capacitor C1 and the switch S4 is also grounded through the switch S5; the switch S1, the switch S2, the switch S3 and the switch S4 are controlled by a Logic controller Logic, and the switch S5 is controlled by the MCU.
The working method of the circuit structure for realizing the step S12 includes:
s121, comparing the voltage waveform sns _ out and the reference level Vbias by the comparator COMP:
(1) when the voltage waveform sns _ out is higher than the direct current reference level Vbias, the comparator COMP outputs a low level to the Logic controller Logic, the Logic controller Logic controls the switches S1 and S4 to be closed, and the voltage waveform sns _ out is converted according to sns _ out-Vbias;
(2) when the voltage waveform sns _ out is lower than the direct current reference level Vbias, the comparator COMP outputs a high level to the Logic controller Logic, the Logic controller Logic controls the switches S2 and S3 to be closed, and the voltage waveform sns _ out is converted according to Vbias-sns _ out;
s122, sampling the RMS value IcoilRMSWhen the voltage is applied, the MCU controls the switch S5 to be closed, and simultaneously controls the switch S1, the switch S2, the switch S3 and the switch S4 to be opened through the Logic controller Logic, so that the negative electrode of the capacitor C1 is grounded, and the reference level Vbias is reduced through the holding action of the capacitor C1, namely sns _ out-Vbias; the holding function of the capacitor C1 means that the voltage difference between the two ends of the capacitor cannot change suddenly;
s123, calculating a mean value Icoil equivalent to an average value Icoil of the current Icoil of the coil in the transmitting module by detecting the voltage of an electrical connection point between the resistor R1 and the capacitor C1 and combining the detection resistor Rs and the amplification factor K to obtain an average value Icoil of the input current IPAAVG。
S2, according to the average value Icoil of the currentAVGAnd RMS value IcoilRMSCalculating to obtain RMS value Icoil of current Icoil in the transmitting moduleRMS。
Based on the circuit structure realized by the above, the mean value of the input current IPA calculated by combining the detection resistor Rs and the amplification factor K is equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVGThe calculation formula of (2) is as follows:
wherein V is a voltage at an electrical connection point between the resistor R1 and the capacitor C1.
For several determined waveforms, the RMS value (effective value) and the AVG value (average value) have a certain fixed proportion relation. The proportional relationship between RMS values (effective values) and AVG values (average values) is derived as follows:
the RMS value (effective value) means that a signal is squared and then integrated in a period, and then squared and averaged, and the meaning is as follows: the amount of work done in one cycle is equal to the amount of work done by the dc voltage equal to that value, expressed as follows:
wherein T is the period of the signal;
the AVG value (average) is the average of the signal over a period and is expressed as follows:
for a signal having positive and negative symmetry, the average value is obviously 0, and the average value at this time may be defined as an average value after full-wave rectification, and is expressed as follows:
in practice, conversion between RMS value (effective value) and AVG value (average value) is often used, and the ratio of RMS value (effective value) to AVG value (average value) of a signal is defined as a waveform coefficient, which is expressed as follows:
obviously, the type of signal is different and the form factor is also different. Table 1 below gives some of the parameters of the waveforms for the common waveforms
Table 1:
thus, the average value Icoil of the current Icoil is derived based on the proportional relationship between the RMS value (effective value) and the AVG value (average value)AVGAnd RMS value IcoilRMSThe equivalent relationship is as follows:
wherein, KfIs an average value Icoil of the current IcoilAVGAnd RMS value IcoilRMSThe form factor of (2).
The waveform of the current Icoil for the coil of the transmitting module in the wireless charging system is basically a triangular wave or a sine wave, which is related to the load of the RX system. Namely:
when the wireless charging is overloaded, the waveform on the coil is close to a sine wave, the table is looked up by 1,
。
when the wireless charging is lightly loaded, the waveform on the coil is close to a triangular wave, the table is looked up 1,
。
and, when the wireless charging is heavy load or light load, KfAre different by only about 4%, so the invention can detect the average value Icoil of the current Icoil on the coil byAVGTo obtain the RMS value IcoilRMS. That is, the present invention enables direct detection of the RMS value of the AC side (coil) current directly on the DC side of the wireless charging coil (input of the transmit module) without introducing the additional cost and power loss of AC side current detection. Besides the method for detecting the input current IPA by the series resistor, the detection method of the invention is also applicable to other methods for detecting the input current IPA, such as MOSFET on-resistance sampling, mirror sense sampling, etc. The detection method has the advantages of convenience, simple circuit, high precision, good safety and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A convenient detection method applied to wireless charging coil RMS current is characterized by comprising the following steps:
s1, detecting the input current IPA of the transmitting module of the wireless charging system, and obtaining the absolute value of the input current IPA and then obtaining the average value Icoil equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG；
S2, according to the average value Icoil of the currentAVGAnd RMS value IcoilRMSCalculating to obtain RMS value Icoil of current Icoil in the transmitting moduleRMS；
Step S1 includes the following sub-steps:
s11, detecting input current IPA of a transmitting module of the wireless charging system, amplifying the input current IPA by K times, converting the input current IPA into voltage information, and biasing the voltage information to be near a direct current reference level Vbias during amplification, namely obtaining a voltage waveform sns _ out relative to the direct current reference level Vbias;
s12, the voltage waveform sns _ out is overturned relative to the direct current reference level Vbias to be averaged, then the direct current reference level Vbias is subtracted to obtain the absolute value of the input current IPA, and the average value is equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG；
The circuit structure for implementing step S11 is:
the detection resistor Rs is arranged at the input end of a transmitting module of the wireless charging system;
two ends of the detection resistor Rs are respectively connected to the positive input end and the reverse input end of the operational amplifier OP _ CS through a resistor;
the positive input end of the operational amplifier OP _ CS is connected with a direct current bias circuit; the direct current bias circuit is used for providing a direct current reference level Vbias;
the working method of the circuit structure for realizing the step S11 is as follows:
the input current IPA flows through the detection resistor Rs, and a voltage difference is generated between two ends of the detection resistor Rs;
the voltage difference is amplified by K times through an operational amplifier OP _ CS to obtain the voltage information;
during amplification, the output of the operational amplifier OP _ CS is biased to be close to a direct current reference level Vbias through a direct current bias circuit, and a voltage waveform sns _ out relative to the direct current reference level Vbias is obtained;
the circuit structure for implementing step S12 is:
the voltage waveform sns _ out is input into a negative input end of a comparator COMP, a reference level Vbias is input into a positive input end of the comparator COMP, an output end of the comparator COMP is connected with a Logic controller Logic, and the Logic controller Logic is connected with an MCU; then, connecting the positive input end and the negative input end of a comparator COMP through two paths: the negative input end of one route comparator COMP is connected with the positive input end sequentially through a switch S1 and a switch S2, and the negative input end of the other route comparator COMP is connected with the positive input end sequentially through a switch S3 and a switch S4; an RC filter circuit consisting of a resistor R1 and a capacitor C1 which are connected in series is connected between an electrical connection point between the switch S1 and the switch S2 and an electrical connection point between the switch S3 and the switch S4; meanwhile, the electrical connection point between the capacitor C1 and the switch S4 is also grounded through the switch S5; the switch S1, the switch S2, the switch S3 and the switch S4 are controlled by a Logic controller Logic, and the switch S5 is controlled by the MCU;
the working method of the circuit structure for realizing the step S12 is as follows:
s121, comparing the voltage waveform sns _ out and the reference level Vbias by the comparator COMP:
(1) when the voltage waveform sns _ out is higher than the direct current reference level Vbias, the comparator COMP outputs a low level to the Logic controller Logic, the Logic controller Logic controls the switches S1 and S4 to be closed, and the voltage waveform sns _ out is converted according to sns _ out-Vbias;
(2) when the voltage waveform sns _ out is lower than the direct current reference level Vbias, the comparator COMP outputs a high level to the Logic controller Logic, the Logic controller Logic controls the switches S2 and S3 to be closed, and the voltage waveform sns _ out is converted according to Vbias-sns _ out;
s122, sampling the RMS value IcoilRMSWhen the switch S5 is controlled to be closed by the MCU, the switch S1, the switch S2, the switch S3 and the switch S4 are controlled to be opened by the Logic controller Logic, so that the negative electrode of the capacitor C1 is grounded, and sns _ out-vbias is realized by the holding action of the capacitor C1;
s123, calculating an absolute value of the input current IPA by detecting the voltage of an electrical connection point between the resistor R1 and the capacitor C1 and combining the detection resistor Rs and the amplification factor K, and then obtaining an average value equivalent to the average value Icoil of the current Icoil of the coil in the transmitting moduleAVG。
2. The method as claimed in claim 1, wherein the absolute value of input current IPA calculated by combining detection resistance Rs and amplification K is equivalent to average value Icoil of current Icoil of coil in the transmitting moduleAVGThe calculation formula of (2) is as follows:
wherein V is a voltage at an electrical connection point between the resistor R1 and the capacitor C1.
3. The method for conveniently detecting the RMS current of a wireless charging coil according to claim 1, characterized in that the average value Icoil of the current IcoilAVGAnd RMS value IcoilRMSThe equivalent relationship is as follows:
wherein, KfIs an average value Icoil of the current IcoilAVGAnd RMS value IcoilRMSThe form factor of (2).
4. The convenient detection method for the RMS current of the wireless charging coil according to claim 3, characterized in that, when the wireless charging is heavily loaded, the waveform on the coil is close to sine wave,
。
5. the convenient detection method for the RMS current of the wireless charging coil according to claim 3, characterized in that, when the wireless charging is lightly loaded, the waveform on the coil is close to triangular wave,
。
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